include: reorganize headers file to include/osmocom/[gsm|core]

This patch moves all GSM-specific definitions to include/osmocom/gsm.
Moreover, the headers in include/osmocore/ have been moved to
include/osmocom/core.

This has been proposed by Harald Welte and Sylvain Munaunt.

Tested with `make distcheck'.

Signed-off-by: Pablo Neira Ayuso <pablo@gnumonks.org>
diff --git a/include/osmocom/gsm/gsm0480.h b/include/osmocom/gsm/gsm0480.h
new file mode 100644
index 0000000..d6626d6
--- /dev/null
+++ b/include/osmocom/gsm/gsm0480.h
@@ -0,0 +1,26 @@
+#ifndef gsm0480_h
+#define gsm0480_h
+
+#include <osmocom/core/msgb.h>
+#include <osmocom/gsm/protocol/gsm_04_08.h>
+#include <osmocom/gsm/protocol/gsm_04_80.h>
+
+#define MAX_LEN_USSD_STRING	31
+
+struct ussd_request {
+	char text[MAX_LEN_USSD_STRING + 1];
+	uint8_t transaction_id;
+	uint8_t invoke_id;
+};
+
+int gsm0480_decode_ussd_request(const struct gsm48_hdr *hdr, uint16_t len,
+				struct ussd_request *request);
+
+struct msgb *gsm0480_create_ussd_resp(uint8_t invoke_id, uint8_t trans_id, const char *text);
+struct msgb *gsm0480_create_unstructuredSS_Notify(int alertPattern, const char *text);
+struct msgb *gsm0480_create_notifySS(const char *text);
+
+int gsm0480_wrap_invoke(struct msgb *msg, int op, int link_id);
+int gsm0480_wrap_facility(struct msgb *msg);
+
+#endif